Louis egger



L. E GGE R.

BOOK SEWING MACHINE.

APPLICATION FILED DEC.YZI, I921.

v Patented Sept. 5, 1922; F I6 .I

, awisfjer 2 SHEETS-SHEET I.

L. EGGER.

BOOK SEWING MACHINE.

APPLICATION FILED DEC.2l,;L9 2-1 7 1 ,428, 1 5 3. Patentd Sept. 5, 19 22.

2 SHEETS-SHEET 2.

FIG.3

Patented Sept. 5, 1922.

PATENT OFFICE.

LOUIS EGGER, 0F SUMISWALD, SWITZERLAND.

BOOK-SEWING MACHINE. i 1 i I Application filed December 21, 1921. Serial No. 523,988.

To all whom it may camera:

Be it known that I, LOUIS Eoona, a citizen of the Swiss Confederation, and resident of Sumiswald, Switzerland, have invented certain new and useful Improvements in Book-Sewing Machines (for which I have filed application in Switzerland, #9,911, Dec. 18, 1920) ,j of which the followin is a specification.

y invention has reference to improvements in the type of book sewing or stitching machines provided with a set or sets of up anddown reciprocating eyed and hooked needles which cooperate with a horizontally reciprocating thread laying device, and it relates more specifically to means for directly operating the punching or perforating needles and the thread drawer from the same cam disc, and further to means for coactingly operating the thread tensioning device and the. sheet stripping-elf device. a

In order to make my invention more readilyunderstood, I willnow describeit in detail in connection with the accompany ng drawings, in which Fig. 1 isa fragmental side elevation of the machine;;'Fig. 2 illus trates a detail. side view, and Fig. 3 is a front view of the upper part of the machine.

The machine, as briefly stated above, is provided with one or more sets of'slantingly reciprocating'needles, each set comprising a one. such set is The two mam standards 1 and 2 are mgrator.

2 Fi'.3. ofiade hookneedle and an eye needle. The number of needle sets required depends upon the length of the sheets operated on. .In the following description it is assumed that only provided.

idly connected by cross-members 3 and '4, and in their. upper portions journal the shaft7. On the latter are mounted, one on each outside of the standards, the grooved cam discs 5 and 6, which both serve for actuating the needles, and the cam disc 6 also for operating the work table, the sheet stripper-01f, the thread drawer, and the perfo- The work table comprises two leaves 8 and 9 (Fig. 1) supported on the laterally disposed support lever arms 10 and 11 respectively, which latter rigidly extend from a shaft 12 journaled in the standards 1 and The table is actuated by means ver 13 whose lower end is rigidly mounted on the shaft 12, and whose upper .roller end 29 engages in the cam groove 30 (Fig. 2) of the cam disc 6. The thread layer is mounted on a rod 15 journaled in the upper part of the table supports 10 and 11, the right-hand end of which rod15 supports a roller 16 which coacts with a suitable shifting device, not shown here, for horizontally reciprocating the rod 15. 1

In the table supports 10 and 11 there is further journaled a shaft 31 from which rigidly extend two levers 30 and 30 re spectively which support between them a bar 32 to which the piercing or perforating needles 33 are secured (Fig. 1) which are guided in the oscillatable guide bar 34. From the left extremity of the shaft 31 rigidly extends a lever 35 which with its roller 36 engages in the cam groove 37 (Fig. 2).

On a cross-head 20, reciprocating in a slanting up and down direction between guide cheeks 21 and 21 is mounted a stitching head 22 with the eyed needle 23, and a stitching head 24 with the hooked needle25. The cross-head 20 further carries at its outer ends 26 and 26' the rollers 27 and 27 which respectively engage in the cam grooves 28 -and28-in the discs 5 and 6 respectively.

spring54. Above the work table there is journaled in the standards 1 and 2 a shaft 38 to which is secured the sheet stripper-off 39, which serves to press the respective last stitched sheet against the just previously stitched sheet. This stripper-off is actuated, without the use of drawrods or other intermediate means. by a lever 40 and a roller 41 directly from the cam 42. The horizontal portion of the stripper-oil, designated by the numeral 43, is formed in such manner that a relatively small angular displacement thereof suffices to enable the operator to insert a spacing block 44 after the stitching of a book has been completed and the work table is swung back into its outer position I, shown in dotted lines in Fig. 1, which does away with the necessity of disconnecting or further elevating the sheet stripper-off 39, as it is necessary to do now in other makes of this machine type.

In the guide cheeks 21 and 21 is journaled a shaft 45 on which are rigidly mounted two thread-drawer levers 47 and 47 con nected by a cross-rod 46, and at the left outside the lever 48, whose end roller 49 operates in the cam groove 37 of the cam disc 6. On the guide cheeks 21 and 21 are further mounted the brackets 52 and 52 interconnected by the rods 50 and 51. The thread drawer, comprising the side arms 47 and 47 connected by the rod 46, as well as the perforator are both actuated from the same cam groove 37.

To the outside of the standards 1 and 2 are secured the support brackets 55 and 55' connected by the shelf 56 and the cross-rods 57 and 57, for supporting the thread spools 58 and serving as thread guides respectively. A bar 59, slotted longitudinally for the free passage of the needles, extends transversely of the latter and serves as counter-pressure member for the perfo'rator. On the inside of the standards 1 and 2 areprovided the brackets 60 and 60 of angle iron for supporting the spacing blocks 44, whilst 61 denotes a vertically adjustable book rest which prevents the stitched sheets from slipping down.

On the cross-member l is mounted a thread brake 62. Obviously, if two or more pairs of stitching units are used, there must be provided a corresponding number of thread brakes. thread tension'ers and thread spools. The thread unwinding from the supply spools is guided through holes in the cross rods 57 and 57', is led around the rods 50, 4:6 and 51, through the brake 62', about the stripper-off shaft 38, and through the eye of the tension spring 54 and is finally passed through the eye of the needle 28.

The operation of the described mechanisms is the following: The sheet to be stitched is placed upon the work table 8, which latter is in the outer, dotted-line position I of Fig. 1. The table is now swung toward the left which brings the sheet below the needle pair, whereupon the perforator needles 33 are actuated for pre-piercing the sheet. The threaded needle 23 and the hook needle 25, about which a thread loop is formed as well known in the art, simultaneously enter the perforations. In advance of this step the thread-drawer levers 4:7 and 47 have drawn out the required length of thread off the spool and have moved from the dotted-line position II into the full-line position III, thereby releasing the thread length. This operation is most important for the proper functioning of the machine, as it is at this point mainly that owing to uneven condition of the thread and irregular spooling the thread is apt to break if it is drawn out directly by the thread layer 1.4. The latter now seizes the thread presented by the eyed needle, passes the thread-to in front of the hooked needle, which meanwhile has been rotated at an angle of 180 by a device well known in the art and not shown here, and places the thread into the hook of the needle 25. Upon the needles 23 and 25 now receding upwardly the thread loop is caught by the hook of the needle 25 and is drawn through the loop which was formed while the preceding sheet was being stitched and which still surrounds the hook needle, whereupon the latter is caused to again execute a half revolution.

During the receding movement of the stitching cross-head 20 with its eyed needle the thread is drawn taut by means of the spring 54 mounted on the cross-member 53. The position of this spring 54 relative to the stripper-off shaft 38 is so. chosen that a close stitch extending from sheet to sheet is obtained' Upon the thread layer 14 having returned into its initial position with its hook laterally of the eyed needle, the work table is swung down again into its outerrnost position I. The stripper-off 39 is moved into the dotted-line position VI (Fig.1) and presses the flap portions of the stitched sheet together, whereuponjit at once returns into the full-line position. Whilst the work table assumes the operative position I the threaddrawer levers47 and 47 move from the position III into the position II and cause thereby withdrawal from the supply spool of the length of thread required for the ensuing stitching operation. A fresh sheet is now placed upon the table and the described operations are repeated. After the last sheet has been stitched a lost or blind finishing stitch is made without the sheet being nterposed, whereupon a spacing block 44 is placed in position, when the stitching operations can again be resumed on the first sheet of a new book.

IVhat I claim is 1 I l 1. In a book sewing rnachine of the character set forth, an: oscillating stripper-off 39 including a rock shaft 38 and means for operating said stripper-off, comprising a cam disc 6 presenting a cam groove 42, and a link 40, one end of which is fulcrumed on said stripper-off and whose other roller end 41 engages in said cam groove 42, and said rock shaft 38 serving also as thread guide in combination with a stationary thread brake 62 and a reciprocable thread tensioning spring 54.

2. In a book sewing machineof the character set forth, in combinationywith a suitable support, a tiltable work table, a stripper-off oscillatingly journaled in said sup- .port above said work table, guide cheeks fixed on said support, a cross-head reciprocably mounted on said guide cheeks, stitching units moun'tedon said'cross-head including an eyed needle, a thread tensioning spring on said cross-head, a thread brake fixed. onsaid support, a-thread drawer comprising *fiXed thread guides, a rock shaft journaled in said support, a bell crank fixed to each end 'of said rock shaft, and a thread take-up rod connecting the upper ends ,of

said bell cranks and roller means at the other ends "of the latter, -a .per foratoi' oscilcommon cam groove for operating said the rock shaft of said oscillating stripperthread drawer bell cranks and saidperforaoff, through said reciprocating tensioning tor; a thread supply, and the thread unspring, and finally through said reciprocat- 10 Winding therefrom successively carried over ing eyed needle.

5 the first of said fixed thread guides, the said In testimony whereof I affix my signature.

take-up rod, the second of said fixed thread guides, through said thread brake, around I I LOUIS EGGER. 

